Metallic packing.



No. 769,566. PATENTED SEPT. 6, 1904. J. J. REDNER.

METALLIO PACKING. APPLIGATION FILED MAY18, 1904.

NO MODEL.

WITNESSES. INVENTOH f, Jafiizfi edn e2" ATTORNEYS Patented September 6, 1904.

PATENT OFFICE.

JOHN JAMES REDNER, OF NEIV YORK, N. Y.

METALLIC PACKING.

SPECIFICATION formingpart of Letters Patent No. 769,566, dated September 6, 1904.

Application filed May 18,1904. Serial No. 208,555- (No model.)

To all whom, it Wuty concern.-

Be it known that I, J OHN J AMES REDNER, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Metallic Packing, of which the following is a full, clear, and exact description.

My invention relates to metallic packings for use on steam-pistons and for similar purposes. The packings of this character now on the market answer their purpose in a general way but those having a lock to prevent them from turning on the piston or other element to which they may be applied are so constructed that they sometimes become caught on one side or in contracted position, thereby permitting steam to pass.

It is the object of my invention to remedy these and other defects by providing a lip-lock packing-ring, which cannot get caught in these positions.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both the figures.

Figure 1 is a sectional view of a cylinder, showing a piston in side elevation, with a preferred form of my invention applied thereto; and Fig. 2 is a sectional view thereof on the line 2 2 of Fig. 1.

In the drawings, A represents a cylinder, 0 a piston, and b a piston-rod. The piston is provided with circumferential grooves a for packing-rings 0. These packing-rings are preferably L-shaped, having extensions 0'. The packing-rings are substantially circular in form; but the two ends are separated from each other a slight distance to allow for contraction and expansion. One of the ends is provided with an integral projection 0 which is smooth on its side 0 which comes into contact with the other end of the ring, and which overlaps the ring for a sufficient distance to prevent the passage of steam. Each circumferential groove 0 is provided with an offset groove (0 constituting a keyway for the projection or key 0 It will be obvious from this construction that the rings 0 will be free to contract and expand and that whether in contracted or expanded position a steam-tight joint between one end of the ring 0 and the keyway will be formed by the plane surface 0" and that no steam will pass through the ring at this point. By making the surface a plane and the key 0 integral with one end of the ring 0 it will be apparent that there will be no possibility of the ring getting caught on one side or in a contracted position. In many forms of packing-rings now in use there is a rib-and-groove connection between the parts, which permits the parts to become caught in the manner mentioned. It will also be observed that by means of the key 0* and the keyway (f the rotation of the packing-ring with respect to the piston will be effectually prevented.

My improved packing-ring is preferably used with an ordinary bull-ring and is designed to be formed in the L shape illustrated in the drawings; but these features might be dispensed with without departing from the spirit of the invention. It will be obvious that other modifications might also be made in the same manner.

By the construction of the packing-ring and lip-lock on the principle set forth a device will be produced which will cause less friction than in the old devices and which will also be more easily and cheaply manufactured and less liable to get out of repair.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- 1. A piston-packing comprising a piece of resilient material in the general form of an incomplete circle, the two ends thereof nearly meeting, and having an integral offset on one end overlapping the other.

2. A metallic packing comprising a circular piece of resilient material having a substantially plane surface, the two ends thereof nearly meeting and forming a space for permitting contraction and expansion, one of said ends having an integral offset from said plane surface, said offset having a plane surface in contact with and overlapping the first-named plane surface on the other end.

3. A packing-ring having an L-shaped crosssection, and an integral key on one end thereof adapted for preventing the passage of steam or other fluid between saidoifset and the ring.

4. The combination of a piston having a circumferential groove, and a keyway adjacent I 0 to said groove, with an L-shaped metallic packing-ring having a key integral therewith, said key having a smooth surface overlapping and in contact with a part of said key.

In testimony whereof I have signed my name to this specification in the presence of two sub- I 5 scribing Witnesses.

JOHN JAMES REDNER. Witnesses:

HENRY A. SOHL, F. E. MOORE. 

